34 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1919. 



indicating the attachment of an area of the 

 mantle; hinge edentulous; a small portion of 

 the periostracum appears to be preserved and 

 shows a black color. Height at umbones, 

 23 millimeters; length, 48 millinieters; diame- 

 ter, 15 millimeters; um])ones beliind the an- 

 terior end, 25 millimeters. 



Station 7070. Pliocene. Horizon C, 100 

 feet below horizon B, at Carter Creek, Arctic 

 coast, in the Camden Bay region. Collected 

 by E. de K. Leffingwell U. S. Nat. Mus. 

 catalogue No. 324311. 



This is larger and broader than the C. 

 Tcurria7ia Dimker, the only species now found 

 living on the coast, and differs in outline 

 from the Atlantic C. siliqua Daudin, wliich 

 has also a more irregular pallial line and larger 

 adductor scars. 



Mya n. sp. ? 



The genus Mya is represented in the collection 

 only by fragments including the more solid 

 parts of the valve near the hinge. The chon- 

 drophore is more oblique than in any recent 

 ^Vmerican species and reseml>les that of Mya 

 japonica, but the receptacle of the flatter 

 valve is entirely different in details from that 

 of any of the boreal species, all of which have 

 been compared with it. This leads to the con- 

 clusion that it represents a distinct sjjecies, 

 but I refrain from naming it until specimens 

 showing the characters of the entire shell shall 

 have been collected. Numerous defective 

 specimens have been examined. Pliocene. 



Fragments were collected at stations 18a 

 and 22a (U. S. G. S. stations 5074 and 5077) 

 from the second beach within IJ miles of 

 Nome, by E. M. Kindle, and at station 7623, 

 from the submarine beach, 30 feet below the 

 sea level, half a mile northwest of Nome, by 

 E. M. Kindle and P. S. Smith. U. S. Nat. 

 Mus. catalogue No. 324312. 



BRACHIOPODA. 

 Hemithyris psittacea Gmelin var. alaskana Dall, n. var. 



Plate V, figures 4, 5. 



Shell very thin, reseml)ling the typical form 

 of the species but much more delicate, pale buff, 

 passing into yellowish gray, surface marked by 

 irregular lines of growth and sculptured with 

 radiating incised lines with much wider inter- 

 spaces; pedicel valve less convex than the 

 other, the hinge moderately strong. Height, 

 22 to 25 millimeters; breadth, 22 to 26 milli- 

 meters ; diameter of pedicel valve, 6 millimeters ; 

 of ventral valve, 9 millimeters. 



Station 7618 (19a). Older Pliocene. One 

 mile north of Fort Davis (Gallatin mine), east 

 of Nome, near the parting of Florence and Otter 

 Creek gulches. Collected by R. D. Mesler, 

 1908. U. S. Nat. Mus. catalogue No. 324313. 



Magasella aleutica Dall. 



I have catalogued this species under the name 

 by which it was originally designated, though 

 I have a suspicion that it represents the Maga- 

 sella stage of development of some larger tere- 

 bratelloid species. It does not agree closely 

 with the young of Terebratalia frontalis Midden- 

 dorff, and Terebratalia coreanica Gould has not 

 been found in the Aleutians. In the absence of 

 any other available species the question must 

 be left open. Pliocene to Recent. 



POLYZOA. 

 Myriozoum n. sp. 



At station 7477, in the dump of an 80-foot 

 shaft about a mile noith of Nome, occun-ed 

 fragments of a Myriozoum wliich were submit- 

 ted to R. S. Bassler. He reported: "This is 

 usually identified as Myriozoum truncatum Pal- 

 las but undoubtedly is a distinct species." 

 The horizon is probably Pliocene. 



